Icom IC-7850 Instruction Manual - Page 241

Previous view 16 MAINTENANCE ■ Troubleshooting D Transceiver power The following chart is designed to help you correct problems which are not equipment malfunctions. If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your nearest Icom Dealer or Service Center. PROBLEM POSSIBLE CAUSE Power does not come on • Power cable is improperly connected. when the [POWER] key is • The internal power supply is turned OFF. pushed. • Circuit breaker is tripped. SOLUTION REF. • Re-connect the AC power cable correctly. p. 3-4 • Turn the internal power supply ON. p. 3-4 • Check for the cause, then re-set the circuit p. 1-12 breaker. D Transmit and receive PROBLEM POSSIBLE CAUSE SOLUTION REF. No sound is heard from • Volume level is too low. the speaker. • The squelch is closed. • The transceiver is transmitting. • Rotate [AF] clockwise to obtain a suitable lis- p. 4-4 tening level. • Turn [SQL] to 10 o'clock position to open the p. 4-4 squelch. • Push [TRANSMIT] to receive or check the p. 4-13 SEND line of an external unit, if connected. Sensitivity is too low, and • The antenna is not properly connected. only strong signals are au- • An antenna for another band is selected. dible. • The antenna is not properly tuned. • The attenuator is activated. • Reconnect to the antenna connector. - • Select an antenna suitable for the operating fre- p. 10-2 quency. • Hold down [TUNER] for 1 second to manually p. 10-5 tune the antenna. • Push [ATT] several times to select "ATT OFF." p. 7-2 Received audio is unclear • The operating mode is selected. • Select a suitable operating mode. p. 4-10 or distorted. • The PBT function is activated. • Hold down [PBT CLR] for 1 second to reset the p. 7-5 function. • The Noise blanker is turned ON when receiv- • Push [NB] to turn the noise blanker OFF. p. 7-11 ing a strong signal. • A preamp is activated. • Push [P.AMP] once or twice to turn the func- p. 7-2 tion OFF. • The noise reduction is activated and the [NR] • Set the [NR] control for maximum readability. p. 7-12 control is set too far clockwise. The [ANT]() key does not • The antenna key has not been activated. function. • Set the antenna selection mode. p. 13-5 Transmitting is impossible. • The operating frequency is not inside a ham • Set the frequency to a ham band. band. p. 4-6 Output power is too low. • [RF PWR] is set too far counterclockwise • [DRIVE] is set too far counterclockwise • [MIC] is set too far counterclockwise • An antenna for another band is selected. • The antenna is not properly tuned. • Rotate [RF PWR] clockwise. p. 4-4 • Set [DRIVE] to a suitable position. p. 4-14 • Set [MIC] to a suitable position. p. 4-13 • Select an antenna suitable for the operating fre- p. 13-2 quency. • Hold down [TUNER] for 1 second to manually p. 13-7 tune the antenna. No contact possible with • RIT or ∂TX function is activated. • Push [RIT] or [∂TX] to turn the function OFF. pp. 7-3, another station. 8-5 • The Split frequency function and/or Dualwatch • Push [SPLIT] and/or [DUALWATCH] to turn the pp. 7-10, are activated. function OFF. 8-7 Transmit signal is unclear • [MIC] is set too far clockwise or distorted. • Set [MIC] to a suitable position. p. 4-13 Repeater cannot be ac- • The Split frequency function is not activated. • Push [SPLIT] to turn the function ON cessed. • The selected subaudible tone frequency is in- • Reset the frequency in the Set mode. correct. p. 8-7 p. 5-38 16-10